How to figure out the width of a string dynamically in SwiftUI

问题

Let's say I have a text called: This. I want to figure out the width of the text called This so that I can assign a width to another view's frame. How do I go about it?

struct BadgeTextView: View {

var text: String

var body: some View {
    Rectangle()
        .fill(Color.red)
    .cornerRadius(3)
        .frame(width: text.???, height: <#T##CGFloat?#>, alignment: <#T##Alignment#>)

}
}  

回答1:

This extension to String should build on Sweeper's suggestion to let you get the width of a String given a certain font:

extension String {
   func widthOfString(usingFont font: UIFont) -> CGFloat {
        let fontAttributes = [NSAttributedString.Key.font: font]
        let size = self.size(withAttributes: fontAttributes)
        return size.width
    }
}

This would be used like so: let width = "SomeString".widthOfString(usingFont: UIFont.systemFont(ofSize: 17, weight: .bold))

来源：https://stackoverflow.com/questions/58782245/how-to-figure-out-the-width-of-a-string-dynamically-in-swiftui